How Women's Immunity Changes After 35 — and What You Can Do About It

You wake up one morning with that odd feeling: you're not ill, but you're not really well either. You drink your coffee, tell yourself you'll feel better soon — but the tiredness lingers. Nothing dramatic, just persistent. It might not be "just" work or the kids. It could be your immune system trying to get your attention.

Why Does Immunity Change After 35?

You may have already noticed that diffuse fatigue that persists despite a good night's sleep. You're not sick, but your energy just isn't the same. This isn't only about lifestyle — your immune system is naturally evolving.

• Naïve cells (T and B lymphocytes), essential for recognising new threats, become less numerous.
• The thymus, the gland that produces a portion of them, gradually reduces its activity.
• A quiet, chronic inflammation called inflamm-aging sets in, gradually weakening your defences.

Nuellia note: These changes are entirely normal — but combined with stress, poor sleep and a demanding life, they can weigh heavily on your wellbeing.

Women's Health: A Particular Case

Women's immunity evolves differently to men's. Research shows that women often maintain a stronger immune response for longer, partly thanks to certain protective hormones. However, this heightened immune activity can also increase the risk of autoimmune conditions.

Around the early forties, hormonal fluctuations, mental load and packed schedules can wear down the body's recovery capacity. Infections take longer to clear, fatigue becomes more stubborn, and stress tolerance decreases.

The Signs That Your Immune System Is Changing

• Slower recovery after an infection.
• Persistent fatigue, even after rest.
• More frequent infections, or ones that drag on longer than they should.
• Increased sensitivity to physical or emotional stress.

Spotting these signals is the first step towards putting meaningful immune support in place.

5 Ways to Support Your Immunity After 35

1. Sleep: The Foundation of Recovery

Night-time is when your body produces the proteins and cells essential to your health defences. Sleeping fewer than 7 hours a night undermines this process.

Nuellia tip: establish a consistent bedtime routine, switch off screens at least 30 minutes before bed, and create a calm, cool sleep environment.

2. Move Smarter, Not Harder

Moderate physical activity stimulates the circulation of immune cells. Too much, however, can have the opposite effect.

Aim for: 30 minutes of brisk walking, yoga, swimming or cycling, five days a week.

3. Eat to Calm Inflammation

Fill your plate with colourful vegetables, antioxidant-rich fruits, oily fish, nuts, olive oil and anti-inflammatory spices like turmeric and ginger.

Limit refined sugar, ultra-processed foods and alcohol.

4. Manage Your Stress

Chronic stress drives cortisol production, which directly suppresses immunity. Build in moments of deep breathing, meditation or creative activities to regulate nervous tension.

5. Keep Up with Check-ups and Vaccinations

As we age, the immune response to vaccines weakens. Regular check-ups with your GP — including vitamin D, iron and zinc levels — contribute meaningfully to immune resilience.

Immune Support: Consistency Over Intensity

Supporting your immunity after 35 isn't about overhauling your entire life overnight — it's about creating conditions that consistently favour your defences. Small, sustained adjustments are enough to help you navigate seasonal changes and limit the impact of viruses.

Listening to and Supporting Your Body

Your body isn't giving up on you with age. It's simply asking to be supported differently. By listening to its signals and adapting your habits, you can protect your energy and your health over the long term.